Lock



Nov. 6, 19340 E. N. JACOB! 1,979,938

LOCK

Filed Sept. 6 1929 2 SheetsSheet l *P m y;

Nov. 6, 1934. E. N. JACOB! v 1,979,938

LO CK Filed Sept. 6, 1929 2 Sheets-Sheet 2 im/QM Patented No. 6, 1934 in re LOGK Edward N. .lacobi, Milwaukee, Wis, assignor to Briggs 8.;

Stratton Corporation,

Milwaukee,

Wis, a corporation of Delaware Application September 6, 1929, Serial No. 396,737

4 Claims.

This invention relates to certain new and useful improvements in looks and refers more particularly to that type of lock havin a removable lock cylinder.

In locks of this character, the lock cylinder usually Jity of locking tumblers having 0 e end 71. ably projected beyond the peripher the c; der to looking position, which heretofore necessitated the insertion of a key to the tumblers before the cylinder could t in tie mounting member. This requirement has been objectionable especially in the assembly of the lock structures during manufacture and, therefore, it is an object of this invention to provide a lock of the character described wherein means are provided to enable the sort-ed in its mounting memher without of a key.

Another object or this invention resides in the provision of a lock of the character described wherein the cyl' der is removable from the mount-ins member when moved beyond one of its normal 11 nits of movement.

And a further object of this invention is to simplify general construction of locks of the character described. and to provide means for limiting the locking movements the cylinder which incorporate the key whereby the use of aspecial key permits the cylinder to be moved beyond one of its normal limits of movement to release the same for withdrawal.

With the above 0t objects in view which will appear as the dose tion proceeds, my inyen n resides in the novel construction, combination and arrangem :it of parts substantially as hereinafter descr' ed and "lore particularly defined by the append d claia. it being understood that such changes in the precise embodiment of the herein disclosed invention may be made come within the scope of the claims.

In the accompanying drawings, I have illustrated one complete example of the physical embodiment of my invention constructed according to the best mode I have so far devised for the practical application of the principles thereof,

in which:

Figure l is a view partly in. section and partly in elevation of a lock structure embodying my invention;

Figure 2 is a cross sectional view taken through Figure 1 on the plane of the line 22;

Figure 3 is a cross sectional view taken through Figure 1 on the plane of the line 33; V

Figure 4 is a fragmentary view similar to Figure 1 illustrating the special key in position;

Figure 5 is a view similar to Figure 2 illustrating the special key in position and the cylinder turned to permit its withdrawal;

Figure 6 is a view similar to Figure 1 illustrating the method of inserting the cylinder without the use of a key and said view being taken on the plane of the line 6-6 of Figure 7, and

Figure '7 is a front view of the mounting member.

Referring now more particularly to the accompanying drawings in which like numerals designate like parts throughout the several views, the numeral 10 represents the mounting member of my improved lock structure having a central bore 11 provided with a counterbore 12 at its outer end and a reduced bore 13 at its inner end.

A lock cylinder 14 is rotatably mounted in the bore 11 and has its inner end operatively connected with an actuating member 15 whose reduced end 15 projects through the bore 13, whereby the locking movements of the cylinder 14 may be imparted to any desired mechanism.

Rotation of the cylinder 14 is normally restrained by the engagement of a plurality of looking tumblers 17 in a longitudinal groove 18 extending inwardly from the counter-bore 12, the tumblers 17 being retractable Within the periphery of the cylinder upon the insertion of a proper key 19 to free the cylinder for rotation and the performance of its normal locking functions. To accommodate the movement of th lower ends of the locking tumblers 17 incidental to the insertion and Withdrawal of the key 19, a second longitudinal groove 20 is provided diametrically oppo site the groove 18.

The cylinder 14 is maintained assembled with the mounting member 1o, by the engagement of a pin 21 carried by the moimting member in an annular groove 22 formed in the inner end of the cylinder; the en agement of the pin in the groove, however, having no eiiect upon the rotation of the cylinder in the performance of its locking functions.

To permit the pin 21 to be engaged and disengaged from the annular groove 22, that portion of the cylinder between the annular groove and its innermost end is longitudinally slotted, as at 23, to form an entrance to the groove, the groove and its entrance thus substantially forming a bayonet slot, through which the pin 21 may be passed whenever the cylinder is turned to align the slot with the pin. It is, however, desirable that the alignment of the slot 23 with the pin 21 should not take place within the normal limits of movement of the cylinder, and therefore the means defining the normal limits of movement are so ar-v ranged that under certain conditions when it is desired to withdraw the cylinder, the cylinder may be moved beyond one of its normal limits of movement to align the groove 23 with the pin.

The means for limiting the movement of the cylinder comprises mounting member stops with which cylinder carried stops cooperate. One of the mounting member stops is formed by extending a projection 24 from the bottom of the counterbore 12, to the inner face of the outermost enlarged cylinder head 25.

The projection or shoulder 24 thus provides an abutment 26 with which an abutment 27 formed by increasing the thickness of a portion of the enlarged head to substantially the total depth of the counterbore 12, cooperates to positively limit clockwise rotation of the cylinder. The shoulder or abutment 27 is so positioned with respect to the abutment 26 that it engages the same when the cylinder is turned to its unlocked position which, in the present instance, is approximately ninety degrees in a clockwise direction from its locked position.

To limit counter-clockwise movement of the cylinder at the instant the tumblers 17 are aligned with the longitudinal grooves 18 and 20, a pin 28 is projected into the counterbore 12 to lie in the path of a shoulder 29 formed on the lower edge of the key 19 and extended through an enlargement of the key slot in the cylinder adjacent the counterbore 12, whereupon return of the cylinder from unlocked position is arrested by the engagement of the key carried shoulder 29 with the pin 28.

As best illustrated in Figure 7, it will be noted that the pin 21 which cooperates with the annular groove 22 to maintain the cylinder against longitudinal movement, is positioned to the right of the pin 28 and thus the alignment of the cylinder carried longitudinal slot 23 forming the entrance to the annular groove 22 with the pin 21 necessitates counter-clockwise rotation of the cylinder beyond its normal locked position, but as the extension 29 of the key 19 prevents such movement,

a s ecial key 31 is provided from which the extension 29 is omitted.

The key 31 being in all other respects identical with the key 19, enables the locking tumblers 17 to be retracted to free the cylinder for rotation and inasmuch as its lower edge clears the stop pin 28 it is readily apparent that the cylinder may be turned thereby beyond its normal limit of counter-clockwise movement to align the bayonet slot with the pin 21 and permit withdrawal of the cylinder.

To provide a positive stop and facilitate the alignment of the bayonet slot with the pin 21, the opposite end 32 of the portion of the cylinder it head 25 or" increased thickness is so positioned as to engage the pin 28 when the groove is aligned with the pin,

Heretofore in looks of this nature it has been necessary to insert the key in the cylinder to retract the tumblers to inoperative position before insertion of the cylinder in the mounting member might be effected, and as this necessity is objectionable, the present invention contemplates means whereby the cylinder may be inserted withi out the use of a key. To this end, the straight bayonet slot with the pin 21. In this manner the inclined face 34 depresses the tumblers 1'7 into the cylinder as the cylinder is moved longitudinally into the mounting member, as is clearly illustrated in Figure 6.

From the foregoing description, taken in connection with the accompanying drawings, it will be readily apparent to those skilled in the art to which an invention of this character appertains, that I provide a novel construction for looks of the character described wherein the insertion of the cylinder in its mounting member is greatly facilitated by obviating the necessity of first retracting the locking tumblers within the periphery of the cylinder.

What I claim as my invention is:

1. In a lock device of the character described, a bored mounting member, a lock cylinder adapted to receive a key and being movable into and out of the mounting member bore when in a predetermined relative position with respect to the mounting member, locking means normally projected beyond the periphery of the lock cylinder and being retractible by the insertion of the proper key, movement of the lock cylinder into and out of the bore necessitating the retraction of the locking means within the periphery of the lock cylinder, and means carried by the mounting member for moving the locking means to said retracted position upon movement of the lock cylinder into the mounting member bore, whereby the lock cylinder may be inserted without the use of a key,

2. In a lock device of the character described, a bored mounting member, a lock cylinder movable into and out of the bore when in a predetermined position with respect to the mounting member, locking means normally yieldably projected beyond the lock cylinder and retractable by the insertion of a key, and cam means formed on the mounting member for moving the locking means within the periphery of the lock cylinder upon movement of the lock cylinder into the mounting member bore, whereby the lock cylinder may be inserted in the mounting member bore without the use of a key.

3. In a lock of the character described, a bored mounting member, a lock cylinder insertable into the bore of the mounting member, key operable locking tumblers carried by the lock cylinder and normally yieldably projected therefrom, 'asertion of the cylinder into the mounting member bore necessitating retraction of the looking tumblers within the lock cylinder, and cam means communicating with the mounting member bore for moving the locking tumblers into the lock cylinder whereby the lock cylinder may be inserted into the mounting member bore without the use of a key.

4. In a lock device of the character described including a bored mounting member having a tumbler receiving groove in communication with its bore, a lock cylinder having locking tumblers normally yieldably projected therefrom for engagement in the tumbler groove to secure the lock cylinderagainst rotation, said tumblers being retractable from the groove to permit rotation of the lock cylinder by the insertion of a proper key, said lock cylinder also being movable into and out of the mounting member when in a predetermined position of rotation relative to the mount- EDVARD N. JACOBI. 

